<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        
        /* .box{
            width: 200px;
            height: 200px;
            background-color: red;
            transition: all 1s;
        }
        .box:hover{
            width:500px;
        } */

        /* .box{
            width: 200px;
            height: 200px;
            background-color: red;
          
        }
        .box:hover{
            transform: rotate(45deg);
        } */
        .box{
            width: 200px;
            height: 200px;
            background-color: red;
            animation:grow 2s linear infinite;

        }
        @keyframes grow{

            0%{
                transform:scale(1)
            }
            25%{
                transform:scale(0.5)
            }
            50%{
                transform:scale(1)
            }
            75%{
                transform:scale(1.5)
            }

            100%{
                transform:scale(1)
            }

        }
     


    </style>
</head>
<body>
    <div class="box"></div>
</body>
</html>